Bidspirit auction | 3 vintage voltmeters: Weston A.C.

3 vintage voltmeters: Weston A.C. Ammeter model 155, Columbia University, circa 1898, 7 1/4” X 8” X 3 1/2.” Weston’s Direct-Reading Alternating and Direct Current Voltmeter, Harvard University, circa late 1890s, 8” X 4 1 - 3 vintage voltmeters: Weston A.C. Ammeter model 155, Columbia University, circa 1898, 7 1/4” X 8” X 3 1/2.” Weston’s Direct-Reading Alternating and Direct Current Voltmeter, Harvard University, circa late 1890s, 8” X 4 1/2” X 7 1/4.” Rawson Electrical Instrument Co. Model 300 ACDC Thermal Voltmeter, circa 1923, 8” X 4” X 7 3/4.”